An obelisk commemorating Lincoln's role in connecting the coasts.

A relic from one of London's worst 19th-century slums.

The luxurious circular mansion built for a Communist leader now lies abandoned.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

This historic motel standing at the "crossroads of America" offers a radio in every room and was saved by local protesters.

A small museum contains one of the largest collections of ethnic and traditional headgear in the world.

Road signs in Namibia mark the location of one of the five major circles of latitude.

A gardener saved a beloved clock face from destruction by building it into a wall outside his house.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

The statues commemorate the legendary mass killing of escaped circus monkeys.

A small island hides in plain sight on Austin's Lady Bird Lake.

Over 75 historically themed murals grace the walls of a small Washington city.

Go back 50 years with a turn on one of the park's carefully restored vintage fairground rides.

A monument to the man who almost killed Hitler.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

A tribute to a Ukrainian heroine who went undercover and killed several Nazi operatives.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

An elderly widow still operates the incredibly detailed model railroad she and her husband built by hand.

A sculpture of a salmon swimming through a brick building.

At this exhibit on the world of poison, venomous animals steal the show.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

Acres of salt crystal pyramids dry in the sun along Thailand's "salt road."

A blunder resulted in these charming stone-lined streams becoming the target of a Nazi bombing.

The remains of the concrete ship can be seen during low tide.